Spool for electromagnets.



G. J. ANDERSON.

SPOOL FOR ELECTROMAGNETS.

APPLICATION FILED SEPT. 10, 1909.

Patented July 21, 1914.

z my ap-Z nderfiom UNITED STATES PATENT OFFICE.

CARL J. ANDERSON, OFCHICAGO, ILLINOIS, ASSIGNOR TO THE CUTLER-HAMMER MFG. 00., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

SPOOL FOR ELECTROMAGNETS'.

Application filed September 10, 1909. Seria1.No..517.,051..

citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful' Improvements in Spools for Electromagnets, of which the following is a full, clear, concise, 'andexact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to improvements in winding spools, and more particularly to spools adapted for .use in electromagnets.

While a spool made in accordance with my invention is adapted for use in all kinds of electromagnets, it is particularly useful in alternating current magnets where it is customary to use. a plunger square in cross section and formed from a ser es of laminations. With such a form of plunger, it has heretofore been difficult to secure a form of ever, that my invention is not limitedto the particular structure shown in the drawing, but is capable of various modifications.

In said drawing, Figure 1 is a perspective view of my complete winding spool, a part thereof being broken away; Fig. 2 is a central sectional view through the spool, showing one end thereof; and, Fig. 3 is a perspective view on an enlarged scale, of

one of the angle bars.

In the embodiment of my invention shown, 1 and 2 are the upper and lower disks of the spool which are preferably formed of suitable insulating material.

Each diskis provided with a centrally dis-- posed aperture 3, which is preferably square: in form. Each disk is also provided with four apertures 4 in one face, which are radially disposed from the corners of the central aperture, for a purpose hereinafter set forth. The core or barrel of the spool is preferablyformed of angle bars or strips 5,

which have extensions,or tongues 6 at one.

end and tongues 7 near their'other end.

-Each tongue'6 is. bent at right angles to the bar and the extreme end thereof is bent downwardly so as to extend into one of the apertures 4.- in the-upper faceiof the.disk.

1. .The end of the tongue is then pressed towardthe ban so that. the portion of the .disk

between the apertures 3 and 4 will be tightly gripped betweenthe adjoiningfaces of the bar and tongue. The lower disk is secured to the bars in a similar manner to the upper disk with the exception that the tongues 7 are preferably struck from the corners of the bars, some distance from the ends there of, so that the ends of the bars project a considerable distance below the lower disk. This construction provides a guideway for a suitable plunger when the spool is used in a solenoid.

In Fig. 2, I have indicated by dotted lines the position occupied by the preferred form of plunger used in alternating current magnets. It will be seen that the plunger fits very snugly, no excess air spaces being left between the plunger and a coil wound on the bars 5.

Specification of Letters Patent. Pate t dp J ly 21,- 1914.

While I have described and shown the winding spool as formed of a plurality of angle bars, it will be understood that the same may be formed of plain bars or strips of material and that the same may be fastened to the disks in many other ways than that shown.

Having thus described my invention, what I desire to secure by Letters Patent, is

1. In a spool for electromagnets, in combination, a pair of disks adapted to'form the ends of the spool, each of said disks having an angular aperture therein and angle strips adapted to be disposed in the angles of said apertures and secured to said disks.

2. In a spool for electromagnets, in com bination, disks adapted to form the ends of said spool, said disks having similar angular apertures therein, and angle strips adapted to form the barrel of said spool disposed in the angles of said apertures and secured to said disks.

3. In a spool for electromagnets, in combination, angle strips adapted to form the barrel of the spool, disks forming the ends of said spool, said disks having angular apertures therein, the strips fitting in the angles of said apertures, and means for securing the disks and strips together.

4. A s 001 for electromagnets comprising a plurality of parallel strips arranged in spaced relation to form a hollow frame and a plurality of disks rigidly secured to said strips in a parallel relation, one of said disks being secured to said stri at a distance from the nearest extremities t ereof.

5. A spool for electromagnets comprising endrdisks each having a polygonal central opening therein and sheet meta angle strips connecting said disks, each of said strips extending through the central openin of each disk and having tongues rojecting 1nto each disk to secure the same t ereto and to clamp the same in one of the angles of the central opening therein.

6. A' spool for electromagnets comprising parallel end disks having polygonal central apertures and a plurality of angle strips passing through the apertures in both disks and closely fitting in the angles of said a ertures, said strips being provided with iilgs rigidly interlocking with said disks.

In witness whereof, I have hereunto subscribed my name in the presence of two witnesses.

CARL J. ANDERSON. Witnesses N. M. -M0FEDRI0,

W. R. HARVEY. 

